Vibration-induced strain and natural frequency of Siak I Bridge were investigated in thisresearch. A Strain was calculated from laser power measured by powermeter. Natural frequency wascalculated using manual calculation with single-girder analysis. The research has been done at fivemeasurement points at Siak I Bridge. The five measurement points were 10 m, 87,5 m, 175 m, 265m, dan 287,5 m from the one point of the bridge in Senapelan Subdistrict. The car used to inducevibration was Xenia and the power measurement was conducted in predawn. The instruments used werelaser diode, Fiber Bragg Grating (?B = 1550 nm), and powermeter. The results showed that five measuringpoints almost experienced strain below 20??.
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